At Duxford MV show in 1988 with my Explorer
Bod: Have you had any problems with the chains in the walking beams?
Me: Actually no, they use a train of gears.
Bod: No they are chains, I used to be in ReeeMeee and changed dozens, they are exactly the same as the diesel one (Pioneer). If you remove the oil filler I will show you.
We find a spanner, remove the filler plug and look inside.
Bod: Oh, you have converted yours to gears, was it difficult?